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Our Team

Our specially trained math instructors will teach your child how to understand math in an individual setting; our unique approach enables us to explain concepts really well and lend a helping hand to every student. Our tutors foster a caring, encouraging environment that helps kids thrive and learn! Read below to learn more about our talented team:

Center Director & OwnerBetty Wang, Center Director & Owner

Betty graduated from New Trier High School and obtained her Bachelor of Science from Northwestern University in Biomechanical Engineering. She is a certified Teacher of English as a Second Language and worked as a software programmer before joining the Mathnasium team. Mathnasium's philosophy on learning and teaching resonated with Betty's belief that learning is at its best when it occurs in a nurturing environment where students can cast aside their fear and frustration. "Mathnasium offers an unique learning environment and individualized learning plans to helps students make sense of Math. It really makes math fun!" At Mathnasium, Betty hopes to help students develop their minds and have fun working out their math muscles.

John Nations, Assistant Center Director

Since graduating from New Trier High School, John earned his Bachelor's Degree from Wake Forest University in Economics. At an early age, he became very interested in math and problem solving. His other passion has been working with children. He has worked as an assistant soccer coach and spent many summers teaching tennis at Old Willow Club here in Glenview. John is looking forward to sharing his passion for math with students and teaching them fun, creative ways to solve problems.


Arusa Khan, Assistant Center Director

Arusa is a graduate of the University of Waterloo, with her major in Economics. In December 2014, she graduated, got married, and soon later, made the move from Toronto, Canada, to Chicago, U.S.A. to live with her husband and continue her occupational journey. While attending the University of Waterloo, she tutored university level students in several subjects including chemistry, econometrics, statistics, and last but not least, math. Also, with her being the oldest of 22 grandchildren, she has plenty of experience teaching mathematics to children of all ages. She is currently studying to take her Graduate Management Admissions Test (GMAT), and following that, will begin applying to Master of Business Administration (MBA) programs, including the MBA program at her dream school, Northwestern University’s Kellogg Gradate School of Management. When Arusa is not busy with tutoring and studying for her GMAT, she enjoys spending time with her family, staying active at her local fitness club, and working as a freelance makeup artist. 


Nika Walczak, Administrative Assistant

Nika was born in Poland, and moved to the US at the age of 7. She graduated from New Trier High School, and continued on to graduate from Loyola University in Chicago with a history major. After college she lived in Japan on the island of Hokkaido as an Assistant Language Teacher, teaching English to high school students in the town of Engaru. After returning home to Wilmette, Nika spent several years as a volunteer at the Field Museum of Natural History, where she continued expanding on her love of history and culture as a docent in the Inside Ancient Egypt exhibit. Currently an administrative assistant at Mathnasium of Kenilworth, Nika enjoys writing in her spare time, as well as taking care of her two cats and one dog.


Andrea Anderson, Instructor

Andrea's professional background includes management consulting, staffing and human resources work, and credit analysis.  She is a Yale University graduate with a B.A. in Economics.  Additionally, she received her M.B. A. from the Kellogg Graduate School of Management at Northwestern University.  Andrea has been a dedicated volunteer in her community, her children's school, her church and for her college in its undergraduate selection process.  She and her husband have raised two sons who are currently college students.  Andrea enjoys working with children through young adults, and she loves math - a great combination for teaching at Mathnasium!

Robert Angerone, Instructor

Robert studies Mathematics and Philosophy at Macalester College. His dream job is to be a professor of Mathematics and to that end he hopes to complete a PHD in Mathematics after undergrad. He enjoys music and spending time with good friends. He also loves a good argument! His favorite part of math is writing proofs. Making clear and concise arguments is an important aspect of mathematics.

Advice to Mathnasium students: It’s totally ok to daydream while doing math! Sometimes it takes a lot of imagination to understand the problems in a way that makes sense to you.

Fun Fact: Robert collects programs from concerts and events he attends. He’s saved almost every program for the last two years!

Favorite number: ‘The square root of 2’ because it is an irrational number, and also the ratio between the length of a side of a square and the length of the diagonal. This shows that even simple-looking geometric shapes can give you irrational values.

Math joke: What is a bird’s favorite type of math? Owl-gebra!


AJ Brown, Instructor

AJ is an upper classman at Evanston Township High School with a passion for mathematics. He has been recognized at regional, state and national levels for performance in Math Team and Science Olympiad. He has taken BC Calculus, MV Calculus, and Linear Algebra, and is currently in an Intro to Combinatorics/Graph Theory course. In addition to mathematics, AJ sails for sport and for fun, and can be found on the water most days during the summer.

Carlyn Chrabaszcz, Instructor

Carlyn is currently pursuing a degree in Applied Mathematics at Brown University. She is interested in becoming a statistician and would like to combine her education with her passion for the environment into a career. In her free time, she enjoys playing the bassoon, composting and reading. For Carlyn, math is purely fun. Math problems are like a game to her and solving makes her genuinely happy!

Advice to Mathnasium students: Don’t get caught up in the idea of those who are ‘good at math’ and those that are ‘bad at math’. There is so much more to learning!

Fun fact: She was the worldwide top score in the app Wedding Escape in 2016

Favorite number: 12 because she appreciates that it has many divisors.

Math joke: none

InstructorBarbara Fonda, Instructor

Barbara graduated from University of Northern Colorado with a Bachelor’s degree in Elementary Education. She went from accounting at an advertising agency to preschool teacher to junior high math and geometry teacher to marketing for a learning materials company. Then came the years of her real passion: being a mother. At times during that period, Barbara tutored math as well as coordinated math programs with tutors and students. When the kids were all in school, she became a part time teacher in a movement oriented preschool. After 16 years there, Barbara needed a change. She currently volunteers at The Art Institute, under the umbrella of the docent program, as a greeter for school groups. Her other volunteer opportunity and passion is cuddling at The Cradle. Mathnasium’s program caught Barbara’s attention as a terrific approach to helping kids understand and therefore enjoy maybe even love math! Tutoring here is a wonderful addition to Barbara’s child-centered activities. 


Tyler Goff, Instructor

Tyler is a freshman at Northwestern University and is pursuing a major in Economics. He graduated from the Latin School of Chicago in 2014. He is a member of the Cum Laude Honor Society and earned the 2014 AP Scholar with Honors Award. Through Jumpstart, Tyler volunteers to help pre-school students learn to read and write in Roger’s Park. His other interests include reading and running. 


 Louise Houghton, Instructor

Louise is a mathematics major at Northwestern University, working on getting an Illinois Teaching Certificate through Northwestern's School of Education and Social Policy. Having worked as a private mathematics tutor since the age of 15, Louise continued to pursue her love of education by doing a year of service with the Americorps nonprofit City Year and working as a teaching fellow for Breakthrough New York over the summer of 2016.Working at the Mathnasium allows Louise to continue her passion for teaching mathematics and making it fun, interesting, accessible and relevant to kids. Making use of dynamic teaching strategies and clear, student-focused instruction, Louise works to aid the Mathnasium in its mission to make math make sense to kids. Having gone to high school in Boulder, Colorado, Louise loves many things outdoors - hiking, skiing, camping, sailing and swimming - as well as reading a quality novel.


Cheng Jin, Instructor

Cheng is currently a Freshman at Northwestern University, planning to study mathematics, chemistry, and economics. He was a tutor for three years at Niles North High School. Cheng aspires to be a teacher in the future, and he has a great passion for helping to make others students succeed and making a difference in their lives. His love for mathematics was developed at an early age, and he would love to share his passions with the students at Mathnasium. Outside of school, Cheng loves to play basketball, video games, and spend  time with friends.


Greg Korak, Instructor

Greg graduated from Oak Park-River Forest High School and attended the University of Illinois, Champaign-Urbana.  He received a Bachelor of Science degree in Civil Engineering with highest honors followed by a Master’s in Business Administration while working for the Army Corps of Engineers.  His first job out of school was with Avon Products at their manufacturing plant in Morton Grove where he held numerous management positions in engineering, production management, quality and financial analysis.  Successive roles expanded to the regional then global levels and he recently completed his forty-year career with Avon as Director of Global Engineering.  During the past eleven years he has been a volunteer tutor focusing on high school math at Family Matters, a community center in the North of Howard neighborhood of Chicago, and he is a past Board member.  He also tutors adults at Connections for the Homeless in Evanston.  Greg enjoys establishing long-term relationships with students and watching them progress in their skills and maturity.  He is passionate about taking the puzzlement and fear out of math for students and replacing it with understanding, proficiency and an appreciation of the joys of mathematics.


Amrita Krishnan, Instructor

Amrita recently graduated New Trier High School and will be entering Northwestern University in the Fall, where she will be majoring in Broadcast Journalism. Amrita received a 35 on the math portion of the ACT with a 33 composite score. She thoroughly enjoyed taking  AP Calculus AB this past year, and hopes to take more math classes in college. Through tutoring her friends and peers, Amrita discovered how much she loves to help students see and appreciate the magic of math. In her free time, Amrita enjoys reading, painting, sewing, and running. 


Ian Kuo, Instructor

Ian is originally from Michigan. He is an undergraduate at Northwestern University studying Biological Sciences and Spanish. With experience in Calculus in both high school and college as well as other tutoring experience, he enjoys math because of the challenge of figuring out how to get to the final solution like a puzzle and wants to share that same enjoyment with others. He is also on the Northwestern Crew team and a part of NU Community Health Corps. In his downtime, he enjoys to ski during the winter or, when he finds the time, he loves to cook.


David Lee, Instructor

David is a UC Berkeley graduate and current second year medical student at Chicago Medical School at Rosalind Franklin University.  He never liked math growing up, because he just focused on the numbers aspect of it.  But with supportive math teachers, he gradually learned that mathematics is more than just numbers; it's about relationships, patterns, and logic.  Math fluency helped David to develop his critical-thinking and problem-solving skills which prove essential to his medical career.  He hopes to spread this same math fluency to the younger generation.

Dusan Markovic, Instructor

Dusan is a recent graduate of Glenbrook South. He has been inducted into both the Cum Laude Society and National Honor Society as well as having received the honor of Glenbrook Scholar . Dusan has completed AP Calculus BC, Linear Algebra, and Multivariable Calculus and plans to continue his studies in math (as well as economics) at Northwestern this fall. His other passions include reading and playing basketball.


Hamed Naimipour, Instructor

Hamed’s experience as a tutor began when he volunteered to help students from an underprivileged school with math assignments. As an undergraduate student at the University of Illinois at Chicago, he had a chance to tutor science and mathematics courses more extensively. He thinks mathematics is a way of thinking with many applications in everyday life. Hamed is delighted to use the Mathnasium teaching methods to help create a friendly environment where students can thrive and improve their math skills.


Serene Philip, Instructor

Serene’s desire to become an instructor at Mathnasium derived from the idea of working in a friendly environment with a personalized approach to individual students. One inspirational quote she enjoys is “The world of mathematics opens up a world that you never imagined when you take advantage of the possibilities it opens up to you, whether it be seeing the beauty in things or opening up more lifelong opportunities” (Author Unknown). Her experience with AP Calculus AB and AP Statistics in high school strengthened her interest and enthusiasm for math. For 3 years, Serene volunteered as a peer tutor, helping other high school students in their courses.


Jakob Reinke, Instructor

Jakob is a senior at Evanston Township High School. He loves math and has taken BC Calculus, and MV Calculus. He is currently enrolled in Linear Algebra and an introductory course on Combinatorics, Graph Theory, and Non-Euclidian Geometry. In addition to mathematics, Jakob is currently conducting research regarding the synthesis of biodiesel. He is involved in theatre and is a student coordinator for Evanston Township High School’s Holocaust Remembrance week. He also loves to play soccer.


Liz Shewchuck, Instructor

Liz is a 2011 graduate of Loyola University in Chicago, with a degree in Elementary Education with an endorsement in Middle School Mathematics. She then went on to earn a Masters in Education from National Louis University in 2013, and taught for three years on the south side of Chicago before coming back home to teach 7th and 8th grade math at the school in Glenview that she attended as a child. In her free time Liz enjoys going to Cubs and Blackhawks games, and hanging out with her golden retriever, Biscuit.


Jake Theis, Instructor

Jake grew up in Northern Virginia where he cultivated a passion for math. He completed Multivariable Calculus before graduating High School with a perfect SAT math score. He went on to attain a Bachelor’s of Science in Mechanical Engineering from Rose-Hulman Institute of Technology in Indiana. Throughout his education, Jake worked as a tutor. First, as part of the upper elementary gifted and talented program. Later, as a resource for Indiana high school students in advanced physics and math as well as his peers in the mechanical engineering department.  Jake is looking forward to sharing the excitement and joy that comes from learning math and using that knowledge to expand intellectual horizons.


Sarah Wong, Instructor

Sarah is a freshman at Northwestern University in pursuit of a Bachelors of Science in computer science through the McCormick School of Engineering.  She graduated from New Trier in 2015, where she gained experience tutoring math to other high school students.  She is involved in the YMCA’s mentoring program Project SOAR and sings in one of the a cappella groups at Northwestern.  Besides her passion for helping kids to gain confidence in math, she enjoys reading, playing piano and guitar, and experiencing the music scene in Chicago.



InstructorAri Ginsburg, Instructor

Ari graduated from Indiana University with a bachelor's degree in Mathematics and Economics as well as Jewish Studies. After university he focused on passing the first 3 actuarial exams. He has tutoring experience in various subjects from when he was in 8th grade through his time as a university student. He credits his middle school math teacher for his love of math and believes that any student can learn to love math with the right teacher. He is currently preparing for the GRE and hopes to pursue a Masters in Statistics. Ari is an avid football fan but unfortunately supports the Minnesota Vikings.


Adaobi Okoli, Instructor

Ada is a graduate of Lake Forest Academy and is currently attending Lake Forest College, pursuing a Bachelor's degree in Environmental Studies. Outside of classes she volunteers at the Open Lands reserve and at various shelters and pantries, and likes to read and draw in her free time. Throughout school she found a penchant for mathematics with help from her teachers, and is excited to help kids gain the same appreciation for math that she has.

OwnerJ. Steve Santacruz, Owner

Steve graduated from DePaul University from the Honors Accounting Program with a Bachelor of Science in Accounting and later received his law degree from DePaul. One of Steve's main passions in life is teaching children. He has been a little league baseball coach since college and enjoys coaching his own two boys in baseball. Steve brings that passion to Mathnasium - hoping to influence and enrich the lives of children through nurturing a passion and appreciation for math. Most students simply need more focused instruction in order to excel. "The Mathnasium method achieves this and much more, due to the richness and breadth of the Mathnasium curriculum. It is the ideal adjunct for a student?s daily classroom instruction, whether the child is struggling or advanced." Through Mathnasium, Steve is excited about being able to teach math to children in a way that makes sense to them. He also looks forward to teaching children the importance of strong study skills, which will serve them in subjects beyond math as they make their way through high school and on to college. Steve and his wife, Karen, are busy raising two sons, Austin and Dylan. They look forward to serving your family!


OwnerKaren Santacruz, Owner

Karen graduated from Western Illinois University with a Bachelor of Science in Physical Education with an emphasis in Athletic Training. She has a Master of Science from Northeastern Illinois University in Exercise Science and Cardiac Rehabilitation. Before starting a family Karen worked as an Athletic Trainer for Illinois Sportsmedicine and Addison Trail High School. She then taught physical education and was the Head Athletic Trainer at Stevenson High School. While raising their two boys Karen has taught PE part-time, coaches her sons' sports teams, is a substitute teacher, and volunteers her time in boy scouting and at St. Joseph school. Karen loves working with children, and is excited about opening Mathnasium!! She has always been a strong advocate for developing fitness in children, and knows how important math skills are to the overall educational development of a child. "I've always been a firm believer in teaching kids in a way they can understand. This allows for a love of learning whatever the subject!! The Mathnasium method does this so well, and allows kids to "work out" their minds!"


Sam Larimer, Director of Training/Operations Associate

Sam hails from northwest Indiana, where he completed his B.S. in Mathematics and minor in Civil Engineering at Purdue University Calumet. His interests vary all over the spectrum, from the great outdoors to an engrossing role-playing game to rooting for the Cubbies, Bears & Blackhawks. Most of all, though, his adoration for math has led him to pursue interests in actuarial science and statistics. New to the North Shore, he is excited to help Mathnasium students break into the puzzle-solving world of math that he’s enjoyed his entire life.